Form 843, Claim for Refund and Request for Abatement, is one of the principal tools taxpayers use to request a refund or abatement of certain penalties, additions to tax, interest, fees, or other amounts. But Form 843 is not just a form. The form itself is only the cover page. The substance of the request is usually the narrative: the factual chronology, legal basis, supporting documents, and explanation of why the IRS should remove or refund the amount at issue.

IRS penalties can turn a tax dispute into a much larger problem. A taxpayer may already owe additional tax and interest, only to find that the IRS has also asserted penalties for late filing, late payment, negligence, substantial understatement, failure to deposit, or another compliance failure.

Receiving a tax notice can create an immediate practical problem: should you pay the amount the IRS or state tax agency says is due, or should you wait while you dispute it?